Flux Modulation from the Rossby Wave Instability in microquasars accretion disks: toward a HFQPO model

Abstract

Context. There have been a long string of efforts to understand the source of the variability observed in microquasars, especially concerning the elusive High-Frequency Quasi-Periodic Oscillation. These oscillations are among the fastest phenomena that affect matter in the vicinity of stellar black holes and therefore could be used as probes of strong-field general relativity. Nevertheless, no model has yet gained wide acceptance. Aims. The aim of this article is to investigate the model derived from the occurrence of the Rossby wave instability at the inner edge of the accretion disk. In particular, our goal here is to demonstrate the capacity of this instability to modulate the observed flux in agreement with the observed results. Methods. We use the AMRVAC hydrodynamical code to model the instability in a 3D optically thin disk. The GYOTO ray-tracing code is then used to compute the associated light curve. Results. We show that the 3D Rossby wave instability is able to modulate the flux well within the observed limits.We highlight that 2D simulations allow us to obtain the same general characteristics of the light curve as 3D calculations. With the time resolution we adopted in this work, three dimensional simulations do not give rise to any new observable features that could be detected by current instrumentation or archive data.

10 pages, 10 figures, accepted by A&A

References in corpus (7)

• X-ray Properties of Black-Hole Binaries
• Accretion-Ejection Instability, MHD Rossby Wave Instability, diskoseismology, and the high-frequency QPO of microquasars
• Rossby Wave Instability in three dimensional discs
• Corotational Instability of Inertial-Acoustic Modes in Black Hole Accretion Discs and Quasi-Periodic Oscillations
• A possible interpretation for the apparent differences in LFQPO types in microquasars
• General Relativistic Flux Modulations from Disk Instabilities in Sagittarius A*
• Nonaxisymmetric Rossby Vortex Instability with Toroidal Magnetic Fields in Radially Structured Disks

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• Impact of Schwarzschild black hole's gravity upon the Rossby wave instability
• Spectral signature of oscillating slender tori surrounding Kerr black holes
• Towards modeling quasi-periodic oscillations of microquasars with oscillating slender tori
• On the Rossby Wave Instability in accretion discs surrounding spinning black holes
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• Electromagnetic variability from circumbinary discs around binary black holes during their post-decoupling epoch
• Sculpting the outer edge of accretion disks in pre-circumbinary binary black hole systems